Excellent analysis. The picture is becoming increasingly clear that a demographic weapon of mass destruction that will explore in the next 20 years with devastating consequences for those that will come of age when it occurs. I cannot see how my generation will meet these challenges while providing for our kids and our own retirement. The economic and political implications of this coming "gray tsunami" are enormous and poorly understood/planned for. I fear that if substantive change is not immediately implemented with regard to reforming entitlements in the U.S. there will be very few other options than to default on "promises" made to the older generation.
As for the rest of the world, this data shows me that much of the world will likely become wealthier as the pie is distributed among fewer individuals, however, overall growth will likely slow unless there is asset inflation or individual consumption reaches levels not thought possible. This also leads me to believe that we will hear endless stories in the affluent work press about the have nots in the high birthrate countries where due to the pie being sliced ever thinner will likely see average consumption and quality of life fall. This is due mainly to the fact that there is very little capital base in these countries already and thus fewer fixed productive assets with which to generate prosperity. This combination of factors coupled with the growing affluence in low birth rate countries will lead to endless tales of unfairness and inequality in the global trading system. This will likely result in continued resentment and possibly armed conflict/terrorism. This will also likely lead to some form of mineral embargo by mineral exporting, high birthrate countries. This type of embargo would be wise and will likely achieve it's stated aim of spreading affluence more broadly, that is of course, if these countries are governed properly and the wealth is used to increase the overall good rather than stolen to enrich a connected few, which sadly, is likely to be the case.
All said, things will be roughly the same as they are today apart from the principle actors on the global stage potentially being rearranged.
SIX ADULTS AND ONE CHILD IN CHINA